package bit.lotterysystem.common.utils;


import com.fasterxml.jackson.core.JacksonException;

import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.boot.json.JsonParseException;


import java.util.List;
import java.util.concurrent.Callable;

/**
 * 实现了JAVA和JSON字符串的转化
 */
public class JacksonUtil {
    /**
     * 单例模式
     */
    private JacksonUtil(){

    }
    private final static ObjectMapper OBJECT_MAPPER ;

    static {
        OBJECT_MAPPER = new ObjectMapper();
    }

    private static ObjectMapper getObjectMapper(){
        return OBJECT_MAPPER;
    }

    private static <T> T tryParse(Callable<T> parser){
        return tryParse(parser, JacksonException.class);
    }

    private static <T> T tryParse(Callable<T> parser, Class<? extends Exception> check) {
        try {
            return parser.call();
        }
        catch (Exception ex) {
            if (check.isAssignableFrom(ex.getClass())) {
                throw new JsonParseException(ex);
            }
            throw new IllegalStateException(ex);
        }
    }


    //序列化方法
    public static String writeValueAsString(Object object){
        return JacksonUtil.tryParse(()->{
            return JacksonUtil.getObjectMapper().writeValueAsString(object);
        });
    }

    //反序列化方法
    public static <T> T readValue(String content, Class<T> valueType){
        return JacksonUtil.tryParse(()->{
            return JacksonUtil.getObjectMapper().readValue(content, valueType);
        });
    }

    public static <T> T readListValue(String content,Class<?>paramClasses){
        JavaType javaType= JacksonUtil.getObjectMapper().getTypeFactory().constructParametricType(List.class, paramClasses);
        return JacksonUtil.tryParse(()->{
            return JacksonUtil.getObjectMapper().readValue(content, javaType);
        });
    }

}
